Excellent presentation and explanation, i agree if it was a bird it would not show or being so close would block most of the aperture.

This to me is definitely a Brian's Blob Phenomena.

The only thing I can think of that this may be is a SLYTH or SYLPHID

A mythological creature that has been given many descriptions and duties, but its main function was to clean the air, repairing damage done by humanity, it is said that their numbers decreased so much due to pollution that their species is on the brink of extinction, this may all sound very occult, but i believe most of myth is based on fact, as we know from viewing the sky, there are many things up there modern science has likely not encountered or made known for various nefarious reasons.

At this point in time I'm willing to accept any reasoning. I truly believe too that the sky is more uncharted than the oceans. I also think I may have recorded this anomaly in the same area before as it was checking out a satellite or a plane that was passing overhead.

It was verified by other skywatchers with credibility.

At the moment myself and ufojoe are trying to get more light or detail from the video because it is quite dark.

It doesn't have a shape apart from "blob" lol. But it looks like it could be expanding and retracting as it floats by. Dunno, just my opinion. Maybe like a jellyfish? And could be why I thought it looked like it had a "flapping" effect.

I was lucky to have caught this. Even the satellite too, I had just been filming orion nebula and left the nv going while I got my a7s camera to film the nebula with better quality. And even then I caught a satellite with that as well :o)

American researcher Charles Fort, who wrote in his work The Book of the Damned, that there were weird, jelly-like beings that live in the Earth's atmosphere. Medusa-like creatures, which had stingers and tentacles, which they used to hunt for birds. The existence of such creatures seemed to be unbelievable for a very long time, until American scientists developed a special substance known as aerogel. The lighter-than-air gelatin is a substance, the state of which is represents both solid and gaseous conditions. Researchers proposed in theory that the flesh of these atmospheric jellyfish could be made of a similar substance. The theory can be partly proven with another incident, which occurred on December 28, 1958, in Florida. in the report, police detective Faustin Galegos found a strange soccer ball sized object outside his house. The detective took the object in his hands, but could not feel that he was holding it. It was a translucent purplish ball, and it was practically weightless. Galegos did not manage to preserve it, because it virtually melted in the air within several hours of finding it. Galegos later stated that he had an impression of holding an unknown dead or dying creature in his hands.

It seems this phenomena has been reported around the world and for some considerable time, Im searching through Charles Fort's Book of the Dammed to try to find what he has to say about it, the book was printed in 1919, so far I have read many things in it that correspond to sights we in the UFO community have also seen. Its an interesting read. Ill post back when/if i find the reference.